vxlan: Call udp_sock_create

In vxlan driver call common function udp_sock_create to create the
listener UDP port.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/Kconfig

@@ -148,6 +148,7 @@ config VXLAN
        tristate "Virtual eXtensible Local Area Network (VXLAN)"
        depends on INET
        select NET_IP_TUNNEL
+       select NET_UDP_TUNNEL
        ---help---
 	  This allows one to create vxlan virtual interfaces that provide
 	  Layer 2 Networks over Layer 3 Networks. VXLAN is often used